Clinical and Molecular Findings After Autologous Stem Cell Transplantation or Cyclophosphamide for Scleroderma: Handling Missing Longitudinal Data
Year: 2021
Type: article
Abstract: OBJECTIVE: Among individuals with systemic sclerosis (SSc) randomized to cyclophosphamide (CYC) (n = 34) or hematopoietic stem cell transplantation (HSCT) (n = 33), we examined longitudinal trends of clinical, pulmonary function, and quality of life measures while accounting for the influence of early failures on treatment comparisons. METHODS: Assuming that data were missing at random, mixed-effects regression models were used to estimate longitudinal trends for clinical measures when comparing treatment groups. Results were compared to observed means and to longitudinal trends estimated from shared parameter models, assuming that data were missing not at random. Longitudinal trends for SSc intrinsic molecular subsets defined by baseline gene expression signatures (normal-like, inflammatory, and fibroproliferative signatures) were also studied. RESULTS: Available observed means for pulmonary function tests appeared to improve over time in both arms. However, after accounting for participant loss, forced vital capacity in HSCT recipients increased by 0.77 percentage points/year but worsened by -3.70/year for CYC (P = 0.004). Similar results were found for diffusing capacity for carbon monoxide and quality of life indicators. Results for both analytic models were consistent. HSCT recipients in the inflammatory (n = 20) and fibroproliferative (n = 20) subsets had superior long-term trends compared to CYC for pulmonary and quality of life measures. HSCT was also superior for modified Rodnan skin thickness scores in the fibroproliferative subset. For the normal-like subset (n = 22), superiority of HSCT was less apparent. CONCLUSION: Longitudinal trends estimated from 2 statistical models affirm the efficacy of HSCT over CYC in severe SSc. Failure to account for early loss of participants may distort estimated clinical trends over the long term.
Source: Arthritis Care & Research
DOI: 10.1002/acr.24785
Authors: Lynette Keyes‐Elstein, Ashley Pinckney, Ellen Goldmuntz, Beverly Welch, Jennifer M. Franks, Viktor Martyanov, Tammara A. Wood, Leslie Crofford, Maureen Mayes, Peter McSweeney, Richard Nash, George Georges, M. E. Csuka, Robert Simms, Daniel Furst, Dinesh Khanna, E. William St Clair, Michael L. Whitfield, Keith M. Sullivan
Institutions: Dartmouth College, University of California, Los Angeles, Vanderbilt University, University of Washington, University of Michigan, Duke Medical Center, Colorado Blood Cancer Institute, National Institute of Allergy and Infectious Diseases, Rho (United States), University of Florence, Dartmouth Health, The University of Texas Health Science Center at Houston, Fred Hutch Cancer Center, Medical College of Wisconsin
Language: English
Subfield: Pathology and Forensic Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: green
Awards: G1037604764, G106547954, Quantitative Biomedical Sciences at Dartmouth, G3202541530, G5001647741, G5161347357, Stem Cell Transplantation for Treatment of Autoimmune Diseases, Statistical and Clinical Coordinating Center for Autoimmune Disease Clinical Tria, G688778501, Rho Federal Systems Division, Inc. NIAID DAIT SACCC, G7779495796, G7938641588
OpenAlex ID: W3199564583